diff --git a/spec/pass_through_spec.rb b/spec/pass_through_spec.rb
index acdc76c..2d8a241 100644
--- a/spec/pass_through_spec.rb
+++ b/spec/pass_through_spec.rb
@@ -25,6 +25,7 @@
 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 # POSSIBILITY OF SUCH DAMAGE.
 
+require "rspec"
 require "tebako-runtime"
 
 # rubocop:disable Metrics/BlockLength
@@ -59,5 +60,36 @@
       FFI::Platform.send(:remove_const, :PASS_THROUGH) if Object.const_defined?(:PASS_THROUGH)
     end
   end
+
+  it "is transparent for other gems in PASS_THROUGH mode" do
+    if RUBY_PLATFORM =~ /msys|mingw|cygwin/
+      if defined?(FFI)
+        FFI::Platform.send(:remove_const, :OS)
+        FFI::Platform.send(:remove_const, :ARCH)
+        FFI::Platform.send(:remove_const, :LIBPREFIX)
+        FFI::Platform.send(:remove_const, :LIBSUFFIX)
+        FFI::Platform.send(:remove_const, :PASS_THROUGH)
+      end
+      ENV["TEBAKO_PASS_THROUGH"] = "1"
+      require "fiddle"
+
+      expect(defined?(FFI::Platform::OS)).to_not be_nil
+      expect(defined?(FFI::Platform::ARCH)).to_not be_nil
+      expect(defined?(FFI::Platform::LIBPREFIX)).to_not be_nil
+      expect(defined?(FFI::Platform::LIBSUFFIX)).to_not be_nil
+      expect(FFI::Platform::PASS_THROUGH).to eq(true)
+    end
+  end
+
+  after do
+    if RUBY_PLATFORM =~ /msys|mingw|cygwin/
+      ENV.delete("TEBAKO_PASS_THROUGH")
+      FFI::Platform.send(:remove_const, :OS) if Object.const_defined?(:OS)
+      FFI::Platform.send(:remove_const, :ARCH) if Object.const_defined?(:ARCH)
+      FFI::Platform.send(:remove_const, :LIBPREFIX) if Object.const_defined?(:LIBPREFIX)
+      FFI::Platform.send(:remove_const, :LIBSUFFIX) if Object.const_defined?(:LIBSUFFIX)
+      FFI::Platform.send(:remove_const, :PASS_THROUGH) if Object.const_defined?(:PASS_THROUGH)
+    end
+  end
 end
 # rubocop:enable Metrics/BlockLength